FOM Institute for Atomic and Molecular Physics - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Phys Chem Chem Phys. 2012 May 14;14(18):6160-4. doi: 10.1039/c1cp22358e. Epub 2011 Oct 13.
We report the energy relaxation of the OH stretch vibration of HDO molecules contained in an HDO:D(2)O water bridge using femtosecond mid-infrared pump-probe spectroscopy. We found that the vibrational lifetime is shorter (630 ± 50 fs) than for HDO molecules in bulk HDO:D(2)O (740 ± 40 fs). In contrast, the thermalization dynamics following the vibrational relaxation are much slower (1.5 ± 0.4 ps) than in bulk HDO:D(2)O (250 ± 90 fs). These differences in energy relaxation dynamics strongly indicate that the water bridge and bulk water differ on a molecular scale.
我们使用飞秒中红外泵浦探测光谱法研究了 HDO:D2O 水桥中 HDO 分子的 OH 伸缩振动的能量弛豫。我们发现，振动寿命比 HDO 分子在 HDO:D2O 本体中的振动寿命（约 740±40fs）短（约 630±50fs）。相比之下，振动弛豫后的热化动力学要慢得多（约 1.5±0.4ps），比 HDO:D2O 本体中的热化动力学（约 250±90fs）慢得多。这些能量弛豫动力学的差异强烈表明，水桥和本体水在分子尺度上存在差异。
